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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '294f5e9d219f93d37c41d429989cc44a91232ec27a69da1149716c3a9813e707' 
  AND token = 'Ydt2dmHyWgm3twV5Hi9DQUdyksXSUzoYId0PzMMY2aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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