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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cebe964bebae9ab17fe995b9a67a816c36a680f8c0286201e53ebb8717dd976' 
  AND token = 'Ha9KF2RkJqoei5eBXw+oYQT/8EyiHDpa82wKMyKKyWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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