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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e53866e0813e54e01b05b474a0b87ec32d77638907c6dbfc4236ed9b6de15b84' 
  AND token = 'Nyuxp93qgdNNRt40De9JfmEYf4Eovr9Tm2IAHdNbScQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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