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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40ac9b4786803d3fa8194b1258082d96ca62e713438ff383f9ca573400fc0ea7' 
  AND token = 'K0oUzcXF9kdrlROxelErz+ApugVJHiV6hc5Idd3QwyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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