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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21abc4699afc11dbc7a50911514a3dcf35c9dcc0d0952f9e21dc72b10953d26e' 
  AND token = '92Se6AhGjfO8jhB5RWdBI7zaszmvrbviXLV7UnkoBEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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