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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '135815adaacf8625a667ec4e58e18b6c95e0f859c5af8980d2f90a8a0fc3b2dc' 
  AND token = 'JF3weBPVf3yHlXQcv4+kk4WIWifZdxvDXpjfjfe6vuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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