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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab3fa8d44fe1c819e07b171094bd603e39f7bb222813343590a8c0bed184699d' 
  AND token = 'XFlze40e4Yt5dlKJru+HOnBDe51pzE5AQdMQkh2tQ48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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