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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9460dbd6f5a415967e8fcf3c404f732ed76e8e5272ea62266fbf17b678856927' 
  AND token = 'NVYrjmqXEKRP9kt7+2bXE1sAmj5FDp/xEkVMqHxtE6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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