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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5d08f73a43f7afbc3b29947c4c7e0d6ba0c8f017a2a45c82a118eaf4e3addb' 
  AND token = '/wo7Te0rcvb547ydLcvLLjpMf5BOYpEezLFQpaO/gpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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