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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd67ffc840ceb890b4d582db3facb9c59720a6db86f5ad812e5a756c012ca5820' 
  AND token = '5l0JCvJKUxbPcSuT1x3BDxCVWZmMfLMCWFibItga610=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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