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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ac35c3f7cce1f9c0e4c3b4e32640146111d921070b18cec9b3bf0d664abc4f1' 
  AND token = 'nwKIOQoFPsDFT8/MY4CGVBhnlXj0iedX0aLXLjbIXIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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