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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f81e14dd4b77550860c83bf765a71e16519e9b95fb0ef0fb5546a80928f522' 
  AND token = 'TkFoDDV46tguGwSI64yP3850HolZm9oAiTXBugi4sNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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