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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a1538772ee8f6ba4cf0cbc28f417f4e31db61a4fcec6ee7e83f7aab860c0e0b' 
  AND token = 'RSRX2BgIxKjXO1SMz0IYkFsyBhphd3YNEGyyiU5bLuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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