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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c907098e71b448c8ddb30d921f2e19dc33f43e1e9b026a7bcfdc4e95191424dc' 
  AND token = 'AxYpBhQeBreaW0tbhE4PuGM3mgxiX5/zSn28mEQ8MqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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