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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75ca6675a80c6f1ad76c0f96ea1b03d8c56120901b0cc780307187d43e4d40ee' 
  AND token = '/HreyPPggzxTqEePJTZ7oVi8M6maT/evZOyD5f8EE4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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