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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503f1e16d434af30d9b5fb7e3e2907a88576653f2d5eea4a7007e797df9f555d' 
  AND token = '27L83W+W3bDrAA9CFomsw+5ODlVxynHJhXejofR85z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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