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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d584a3560c86461724b79a9a9ae0210ebd0f26caed158dcea2a7fe3095b50df' 
  AND token = 'gOSmWDxLZhlrkQmNyiUbGUu21uUrGW5tpe6YepMwVMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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