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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05c3c5588879b06d2ba3f166df6580bd339eb06e304cd388debeef8fca5a2732' 
  AND token = 'b3uvfDqOkOiItSypQ/sx50+8wIpKN2f+gJtkTpcbelM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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