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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e89ad73dd1ef8a23a58460c2cef8a5eba439b8a60e5a00303408f519d841843d' 
  AND token = 'IJLQUPOmf+ng+cf38WeLFhGxlIUJ5a3r0wWmpvOxhMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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