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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a9d38ee7e51489bc5e2d0b8ef2c4c8f866f90425d86d83cfcef672fd67a8376' 
  AND token = 'ydmJgqUfA7GhZb/CB6/gnr/eIOo1w9w3sAR0Hnmrwh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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