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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4612177af72a3f757ed1deafc8a07b7cb9bb70a009bafaea448e318a1656ea50' 
  AND token = 'PR6qcAl9zUXC1hgdfvQXjYUKn7CbAACEGlnED0+pE/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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