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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f93d08cc26c1c83e9f8a439b5b9db54d4250b7bfb3fbda680c06222ff7b233' 
  AND token = 'OdvlPI997NFUpOjPUZRLzJMez4W7taN9M+JOJ/cKylg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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