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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de7c70e8ce5f9fcd25ba3e0e649d99a64cb779a9d7bbec97edf25cd9132a5a6e' 
  AND token = 'TeVkng4N51Pbl3dcF5g3xZQtMsQythSh1AY3fqDBEaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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