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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71e5235d464a0963e514ce1944315429f7b7a180da8e3b9cc407e5bbcd745ad' 
  AND token = 'RoelOOrO7GutPIfRfjBgnItO9cTNDPwRRAK/e6X1xoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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