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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a4e9cdeee2077a7f2c5f4f7e2b01302204775e3ae8cc32605daebf03888ed6a' 
  AND token = 'smIMuuUElPu5K4NG7d3Jcp24Bv+3iMkhY/a22Hw5GNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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