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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8472139052d5838db22cebef3caacf0c01a4160aab0fdb17c37d272853d5a204' 
  AND token = 'sntdCorCVN3fe97LEIBZ8Yav/jMD9eQu2ntoSsq9HnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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