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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ea84c605ff943d4d078e8b8867ce09316a6376cbd8b60771e4ac6d65a1a4bd5' 
  AND token = 'Sr7QHlINUDZUuGZa4QcwHBtcl62yz+H1edpJVXyTU2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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