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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab5de6a133016dd3badc2a985df6d58589d6cc23ec0bca083d56cf156994992' 
  AND token = 'LngHmlbbnZpzWbddH04T/aAQfUQpM9z7qOO0vFWHDeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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