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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70debfd9dc2fc993c659152e76397adb706dfac7117b2adb1c57c4439534eaa8' 
  AND token = 'MHUDtH7aJ0JXKn8kActLMDf6Lg0ndKblLT2sxzn8Fww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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