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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032b74728b854caed5edc82c2f4d0f539c286e5094d64f323054bf198b84c283' 
  AND token = '5ZOAbd/uVeRAcTf2uDnb0SavC++lCAS0eGnpZdLCrPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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