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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b50244e412038a4bd48856cb8a6c85f61951a51e0a254e50c2060c4fb68fd3de' 
  AND token = 'K2wj6gGhkusU/iypiQEbsZ2o00I0bdzqXu/Ovli3a18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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