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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83257c4db023db87a121fa026744db4d572ed5e67b4b0498642b2cc3b4ee9960' 
  AND token = 'GKKBNorew9rxeRu8ZiJIJGCp5wi+5ZM/Wh6ju1JW03A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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