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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c2e7ba206cc5ffa938f595fca6433d22eb998275e5dc44b3cd318d689bba8fe' 
  AND token = 'TGo6VsG9KCS1W6ioezXp91Z0L2iiRegqqY3X/wadl3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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