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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de6693cbd91153b342fa77c03dadf6f6a521be2f4a9f78d6bb6e117487af971' 
  AND token = '3Ui7mWkGg/j4g9jtOgib6hZFOI0yIRbAbVm0Vv3hxnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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