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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d202c5e58fe32ab522c07aeeebd13fd8b8d6bbdbe46a0c29940092d23e06cb' 
  AND token = 'MMd5dUH6r+xqAXMbg95WOD4MeDekTVz8PszJE81kjLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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