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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cfba960031254bad7043d8515a7a0b82883ff4c98430d7828e540ad1f06aebe' 
  AND token = '+WizmGjF4q6aUkxJHx8JASTqqoa33gKqcUDgQbqSeJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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