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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7c6d6f1e6242119308c6a7b41f14a6e5a8a81d3f31903723809d8e0f081010' 
  AND token = 'r56JqkSlBG4MdQgZCz+ukh9VybtWmEPz80YaGryJT8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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