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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5818717b4c32f11c646a672387d8ff3a233e4b01b7d9ef0a2a5ff3c383366141' 
  AND token = 'HDvW/hYkw8zzETfIbk08q8HIH0gnN9s6Mj8WKa18Mco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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