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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4eca9f915314a413d993c3f55b35e85c2d6e1bf5d8a7bea637cc7f526b2679c' 
  AND token = 'Zu9u/XrD2KpbzaNpvsS7pVjDuSofuQ3GSK4t8I0uOn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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