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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c9b733e85d44e3801c6db622142eb6e9bb38b434b348e510157ca8fc5d121fc' 
  AND token = 'yxxXD7S297UhNfp3shmSGualGGZPhP9oee1euIOH+ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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