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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12db313827e9a7ea6b7483290716041bb07c901022c9bb6d0b9ba56689cda85e' 
  AND token = 'ak0vXQ2E2H0Xv326c7PMm418J9iXdVwQ6HeqbKyDlhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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