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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf26db79ab647bce17d6887862de11b0a460d40bac6da6b3f8ecedfd0af422b' 
  AND token = 'SvkRJ6ksU0zD27+lkv1YEASbARYdYM2UDKApf8X0iqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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