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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f4029d6ac7571842ee8c82984f62839721de42faf770763627622aade34cb0e' 
  AND token = 'HuHjKXjsWPhWUa4/rY7Z0bjfMT3RnOnRXmYuRXQJlHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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