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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64efb83189eaa2d55b86fb9dfe2d30117b6ad57e23378d835711dd3e26d7bbea' 
  AND token = 'pRc2T0i9+Gu/9+76wuhKkSjUk3Jg9jydFpR3KFzG1fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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