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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a54fb63fba4d71841661e28fcd4868899e8c2d4ee52353e5d472ddbff971aaf' 
  AND token = '1txrJbf83m4EBBGBhKtxzhFLxvhBN8Ao5ZRIsUsltqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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