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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '641f58aee2dfb75ed6b537fb0e15a9fedb28d767321003838a3a745a3eb2743b' 
  AND token = 'b56BqhYgxJ8QuNMO/7dhXPh9ikti3cBbN5aXXqtB7aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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