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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c3c157e0574a19e848a0c8a4f8aef26f732f3964130d56f5281a8600d35fb0' 
  AND token = '5sRZWCfv+ntzdtC4yOhnnsNYD+2bNP/kLwepeNtUNWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}