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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c414db8cf5084728f1e099b39642e8873433663434ab173c28ab4f4797a60d6' 
  AND token = 'FOEav6d2bTKaMZoq4sA5bJEmGY4za5I7kFGhjGsS71g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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