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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773513e100c80842c03249e17d086e6885381d562cb4f83765299818c41648a9' 
  AND token = '4VnRsPaAVTq959Q1KYn9MPDXZQiESH1oE5Xh1eQP/bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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