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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8041167e63dee67eaf729ba81b3be2c1fbfff83951c706f11cf7dbdb8f7e954' 
  AND token = '39qzZcKJdnXsiW1VGfSp8VK0w0EMH72dKUfX1mo0t7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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