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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0fd78ebb939d10d6ac7f63651150c80591c8ef40981c792078582aa00f20d6c' 
  AND token = 'UAgyefKpi2X2jWSf2SDz6nZ47TbaUbYAgK4znGzQT9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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