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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd10dd43c3cf7eeb8754abebffee847d9745f2ba7ec92c8b0e7e3fddfbfacf448' 
  AND token = '8xiN0GBO/YK0D4i8kamf2m2ebd82RZNa0XDp54WlqWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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