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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b99fda78e4bb500434b1680d5879afdc91ac32465042a0e5f9f33c8bf67cb27' 
  AND token = '03zQbbCDXnnHhnlxxTm7Xm43w9gQE63MZSsO/wrER7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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