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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ba0a36384a7c578702390a48f33e1a44198a87be093ef7ad71ed5ab05d6670' 
  AND token = 'uDqM8p86QqUfloE57lbWyZ7qQ+UURAcndWaGNhja1sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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