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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c99aa11c86ac0019a8f4a232a4f03794cb5347db56305c41d9357a31f86b34' 
  AND token = 'ckucf9QRZJ+hFqOky2w2ccaW9wQbyGpvZwi0WMyDUbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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