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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83edeaf9eba1ab34e28619818f5400ed254d7fd37cde67679ee8175ef70e86e' 
  AND token = 'cIwCE/IwImJH8gvtOyvlHsdSNuQDvzg1BvyJ8K4N0ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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