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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eebebf6d6bc5b8530743c4c4eb7ba12bae6f13eab5a66909686490e68e49c6c' 
  AND token = '6Svdj0ABtbhvwI45zL6bQfxr5AG0zULHEOejVi80Wkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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