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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f677e70e3528ad29101759ee4a5c9115a9f77d4da5a1326967b7d7495bbd5e7e' 
  AND token = 'zdFlwB7TWKDp0uwKQeBtxV8ULu1ZHXxa7K+jkWUVPoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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