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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45b79ba518534b31394ccbd5aaad8147bc2a908ff31d9bcf307d5034fa00e5b1' 
  AND token = 'xi/61qJ2aoqjcdx8LWA4zUjHa7GdHWfWCt+iIqg7O/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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