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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cccf19b599829cea9cb6481e3643c39b12df1f2e9d69bd7ed87f2b0489aeda6e' 
  AND token = 'Q1th4aK0n8Ht15GytdzNOlGnysqaTl6R5MTFY0h394s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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