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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ea2d8ef56ba6a65ac149c3b69ce4e082adc6a166c1b7ca3ad4d8bd70912476' 
  AND token = 'QjHGGGS425QKStQd7hAjCvPh9LVYv6BNhhuIDLUCU6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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