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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '516a9a29cface4c51f2b773a9c62fa6cf8922d19814e40776fc75a28beee3b2b' 
  AND token = '8ed2ORD5kNjbL37UQ/mDO+UhYAcvn/NFU0uyOa6wHpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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