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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ed0e260494e828d8548e800b347085de2bf1cb1a31aa06153fa1e41b8be39d' 
  AND token = 'Ilb6xn1/9vWTajUmIhMrDsarvoeON9n18TQJvpn8ln8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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