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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '724d00eab8d75565def374b6ae7366331c8db3fdf1631ec40eb1e5c1e46d0ecd' 
  AND token = 'EJOeHzb9xKlu3+WT7xS17HM09Xq/hB8b8U8ZYuwxghI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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