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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21c05683fe3439a34beaf014927cc19023de52aa8cd2af4d80208c7e112cdd8e' 
  AND token = 'FWrTglO82AbJ6MRL14JXrL4cfNfKzWnz+db4dmUURWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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