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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d7d75046db0feb9232f4b9057f50f0f8142dadeea541b5558cfc907ba38f3f1' 
  AND token = 'MyFo7YPTpTxvaUpt8Z7cx+obtGRvM44fovglBHdSrn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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