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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac711a085d260b7002c01c57d17efac28b0fc5a073f60385ef0d66f24ee1d6bb' 
  AND token = '0OxYKHkni/zPKAFVETUH5GaMTaosJ5eZh/0nyU9Rmbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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