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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c8f94fcb6b56a81ae96d60820b2583328f8d9180db2fec4e48abaee4779ed23' 
  AND token = 'ONiCJmzInQPzLyW4cHjojt+KcPnil3/ukkGMmT0++9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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