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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be936f9b80227f5d1aa71834bb9aecbae99bdf93d1122002341d876f917b7c2' 
  AND token = 'xNOwi46UGjXJ1zj8bGI8jaGvZ8JoGAapfEi7CD0SsjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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