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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c65e91ece184ed207d924f40d34f5d898e770cc5795c0cf73b237c2c9a3dc123' 
  AND token = 'DocVRvNIW663TustJg23VF9jrpTAuKzwCsKYlBtPyRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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