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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '040413e9a16769188fec2a59ddb609606ef6b11e6fc59915d188f3505266aec8' 
  AND token = 've+AI4XlxY6+z4Xg3MCbDj4yIUZFqt5sk482cFYq82s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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