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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c9b41879de17585b775042b16f28afb3718ef4438dc45e69f44291ecf5c993' 
  AND token = '79paqNx4E0j6dcSd2fgPVf5qB8mfjqhUcZEFFmuvCCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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