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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0172d73d8efebc545fa1dbbc9ee6b00c78fe7c2ab3a3590c95a3bf47d76523e9' 
  AND token = 'HR5XlZ7Ta3GgnOf8AfXreoX8WqN7S1yLvRc/8x7xMMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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